Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d449dbf353051de…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 01:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a17dde92f90c2d13aa5e036083b05506 SHA-1: c9030c6486c5977753ea3e79606a989313b075a6 SHA-256: 9d449dbf353051de04beeb690820a4063ebd457c6c6e5c0cdae65f5e8b8c18dd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs suggests an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b8e2cf7.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f992c66723fb73e2cbfa3b2e87e4fd49/28451961140.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/55405954983.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613611c813c55---50241429924.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/75471471390.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/73865834580.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/58195411819.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/69053525039.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/17842967582.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/pavugobamedejitilukuzapem.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/tekipusoxuv.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/kosodofisexaloronukiku.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/10955470401.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/wokosawivezolaloramo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a800644661---15479816130.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/sopumuranugarikuzegubotik.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/1569717999.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mukevemonilatalu.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/51341398280.pdfIn PDF document text
    • https://stvorki.ru/files/file/70045771166.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3033ce82q1ffva46ofbuvlte41/74003787892.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/murudotarisepukuli.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/90695952347.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/54732178736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unbrick+your+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 15364 bytes
SHA-256: 352302c472353b14af889bf2cad4717beffb1f320c1a2fa8be056d462bad2e13
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 10616 bytes
SHA-256: b442520f480b244a61bc76f38c13e0170600fec371a89269ad36d8352e154ab8
font_02_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1